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United have until 5pm on Friday to register him for Saturday's FA Cup third-round tie against Sheffield United, although Louis van Gaal may decide to ease the forward back into the first team set-up after a couple of games for the Under-21 side instead. Januzaj has not played since Dortmund's 1-0 defeat to PAOK Salonika on December 10.

Van Gaal had warned Januzaj last year he was taking a risk by joining Dortmund, rather than a lower-profile club where he would have been guaranteed to play more.

"In a club like Borussia Dortmund, all the players there are also of a certain level and I said in advance: 'that's a big risk for you because you have to compete with other players of a higher level' and that is not so easy," the United manager said in November.